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arXiv 1407.4468astro-ph.HE
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吸积中子星中吸积态和$\textit{Fe K absorption}$之间的联系:类似黑洞的软态风?

A connection between accretion state and $\textit{Fe K absorption}$ in an accreting neutron star: black hole-like soft state winds?

G. Ponti, T. Muñoz-Darias, R. P. Fender

摘要:

吸积恒星质量黑洞的高分辨率X射线光谱揭示了吸积盘风的存在,高电离铁K线跟踪。这些风似乎有一个赤道的几何形状,并观察到只有在光盘占主导地位的国家,其中无线电喷流是缺席。吸积中子星系统也显示出赤道高电离吸收体。然而,与吸积状态的任何相关性的存在以前没有被测试过。我们研究了EXO 0748-676,一个瞬态中子星系统,我们可以可靠地确定其吸积状态,以研究Fe K吸收/吸积状态/喷流的联系。没有一个在硬态获得的20个X射线光谱显示任何显着的铁K吸收线。然而,强烈的Fe ${\scriptsize{\rm XXV}}$和Fe ${\scriptsize{\rm XXVI}}$(以及很少观察到的Fe ${\scriptsize{\rm XXIII}}$线加上S ${\scriptsize{\rm XVI}}$ ; S ${\scriptsize{\rm XVI}}$和Ar ${\scriptsize{\rm XVII}}$的混合物; Ca ${\scriptsize{\rm XX}}$和Ca ${\scriptsize{\rm XIX}}$,可能由相同的高电离材料产生)吸收线($EW_{\rm Fe~{XXIII-XXV}}=31\pm3$ eV,$EW_{\rm Fe~XXVI}=8\pm3$ eV)在唯一的软态观察期间被清楚地检测到。这表明,Fe K吸收和状态之间的联系(以及Fe K吸收和喷流之间的关系)对EXO 0748-676也是有效的,因此它不是黑洞系统的独特性质,而是吸积源的更普遍的特征。

英文摘要:

High resolution X-ray spectra of accreting stellar mass Black Holes reveal the presence of accretion disc winds, traced by high ionisation Fe K lines. These winds appear to have an equatorial geometry and to be observed only during disc dominated states in which the radio jet is absent. Accreting neutron star systems also show equatorial high ionisation absorbers. However, the presence of any correlation with the accretion state has not been previously tested. We have studied EXO 0748-676, a transient neutron star system, for which we can reliably determine the accretion state, in order to investigate the Fe K absorption/accretion state/jet connection. Not one of twenty X-ray spectra obtained in the hard state revealed any significant Fe K absorption line. However, intense Fe ${\scriptsize{\rm XXV}}$ and Fe ${\scriptsize{\rm XXVI}}$ (as well as a rarely observed Fe ${\scriptsize{\rm XXIII}}$ line plus S ${\scriptsize{\rm XVI}}$; a blend of S ${\scriptsize{\rm XVI}}$ and Ar ${\scriptsize{\rm XVII}}$; Ca ${\scriptsize{\rm XX}}$ and Ca ${\scriptsize{\rm XIX}}$, possibly produced by the same high ionisation material) absorption lines ($EW_{\rm Fe~{XXIII-XXV}}=31\pm3$ eV, $EW_{\rm Fe~XXVI}=8\pm3$ eV) are clearly detected during the only soft state observation. This suggests that the connection between Fe K absorption and states (and anticorrelation between the presence of Fe K absorption and jets) is also valid for EXO 0748-676 and therefore it is not a unique property of black hole systems but a more general characteristic of accreting sources.

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